Need help with simple turnaround render
Turnarounds are generally made leaving the character still, and having the camera orbiting: this can be achieved creating an empty in the center of the orbit, parenting the camera to the empty and rotating the empty: you will have to set at frame 1 a rot keyframe value of 0, then set at frame 37 a Z rotation of 360 (Euler rotation), then go to graph editor, select all keyframes, press T and set the interpolation to "linear" and run the animation from 1 to 36.

If you really want to rotate the character, as it is posed, every movement has to be performed by the armature in pose mode, do not rotate the mesh in object mode, because the character is child of the armature, not the inverse. If it is not present, you will have to create a "Main" bone and set all others bones child of the main, eventually parenting all tools and platform to it, then animate the rotation of the main bone.